switch — exhaustiveness, ranges, tuples, where
Use powerful switch with exhaustive cases, numeric ranges, tuple matching, and where clauses.
switch — exhaustiveness, ranges, tuples, where is a free Swift Academy lesson on CoddyKit. This is lesson 2 of 3. Any 3 lessons of this learning path are free to read in full — after that, CoddyKit PRO unlocks every lesson, plus hands-on practice with a built-in code editor and a 24/7 AI tutor. It is part of the Swift Academy learning path, and your progress syncs across the web and the CoddyKit app. The Swift Academy course includes 3 lessons in total.
Intro
switch in Swift is expressive and safe: it is exhaustive and supports ranges, tuples, and where clauses.
Basic switch
Switch can match strings and must be exhaustive via cases or default.
let fruit = "apple"
switch fruit {
case "apple": print("Good fiber")
case "banana": print("Potassium")
default: print("Tasty fruit")
}Ranges
Use ranges like 90...100 (closed) and 80..<90 (half-open).
let score = 73
switch score {
case 90...100: print("A")
case 80..<90: print("B")
case 60..<80: print("C")
default: print("D or below")
}Tuple matching
Match tuples and bind values with let; add where for extra conditions.
let point = (x: 1, y: -1)
switch point {
case (0, 0): print("Origin")
case (let x, 0): print("On X-axis, x=\\(x)")
case (0, let y): print("On Y-axis, y=\\(y)")
case (1... , let y) where y < 0: print("x >= 1 and y negative")
default: print("Somewhere else")
}where clause
Use where to refine a pattern, keeping logic inline and readable.
let number = 12
switch number {
case let n where n % 2 == 0: print("\\(n) is even")
default: print("odd")
}Fallthrough behavior
Swift does not fall through cases by default, reducing bugs. Use fallthrough explicitly if needed.
Switch safety
Quick check: What makes Swift switch safer than many languages?
Recap
Recap: Swift switch is exhaustive, supports ranges and tuples, and can add where conditions; no implicit fallthrough.
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Frequently Asked Questions
Is the “switch — exhaustiveness, ranges, tuples, where” lesson free?
Yes — any 3 lessons of the Swift Academy learning path, including “switch — exhaustiveness, ranges, tuples, where”, are free to read in full here on the web. After that, CoddyKit PRO unlocks every lesson, plus interactive practice with a built-in code editor and a 24/7 AI tutor. The Swift Academy course includes 3 lessons in total.
What will I learn in “switch — exhaustiveness, ranges, tuples, where”?
Use powerful switch with exhaustive cases, numeric ranges, tuple matching, and where clauses. You practise Swift Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Swift Academy?
No prior experience is required. Swift Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 2 of 3.
How long does the “switch — exhaustiveness, ranges, tuples, where” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Swift Academy lesson?
Yes. Every Swift Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- if/else basics
- switch — exhaustiveness, ranges, tuples, where
- Loops — for-in, while, repeat-while